#include <iostream>
#include <map>
#include <string>
#include <cstdint>
#include <vector>
#include <set>

using namespace std;



void LoadNotes(uint8_t notes[10000], int& PattLen, int& PattNum, int& N)
{
	cin >> PattLen;
	cin >> PattNum;
	cin >> N;

	for (int i = 0; i < N; i++)
	{
		cin >> notes[i];
	}
}

struct pattern {
	pattern(int StartIndex)
	:startIndex(StartIndex), numberOfOccurence(1)
	{}

	int startIndex;
	int numberOfOccurence;
};

// Returns the number of valid pattern of a certain length
int GenerateAllPatternsOfLen(uint8_t notes[10000], int len, int pattNum, int N)
{
	// Map patterns to their number of occurence
	vector<pattern> patterns;
	// We stop at len - 1 since there is no point in checking for an
	// overflowing pattern
	for(unsigned int i = 0; i < N - (len - 1); i++)
	{
		bool existing = false;
		// Check if it's an existing pattern. If not, add it
		for (int j = 0; j < patterns.size(); j++)
		{
			// Compare the pattern
			int result = strncmp((char*)&(notes[patterns[j].startIndex]), (char*)&notes[i], len);
			if (result == 0)
			{
				existing = true;
				patterns[j].numberOfOccurence++;
				break; // We can only match one pattern of a given length
			}
		}

		if (!existing)
		{
			patterns.push_back(pattern(i));
		}
	}

	int sum = 0;
	for (unsigned int i = 0; i < patterns.size(); i++)
	{
		if (patterns[i].numberOfOccurence >= pattNum)
		{
			sum += patterns[i].numberOfOccurence;
		}
	}

	return sum;
}

int GenerateAllPatterns(uint8_t notes[10000], int pattLen, int pattNum, int N)
{
	int sum = 0;
	// We stop at N - pattNum since there is no way we can have pattNum occurence
	// of a pattern of size more than N - pattNum + 1. i.e. N = 3, pattnum = 3
	// it is impossible to have 3 pattern of size 2
	for (int i = pattLen; i < (N - (pattNum - 1)); i++)
	{
		sum += GenerateAllPatternsOfLen(notes, i, pattNum, N);
	}

	return sum;
}

int main ()
{
	uint8_t notes[10000];
	int pattLen, pattNum, N;

	LoadNotes(notes, pattLen, pattNum, N);

	int result = GenerateAllPatterns(notes, pattLen, pattNum, N);

	cout << result;

	return 0;
}